ANSI C Implementation of MATLAB functions FILTER and FILTFILT

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I received many requests about the code for the ANSI C implementation of MATLAB functions filter and the zero-phase filtering function filtfilt that I originally put at Unfortunately, this site tends to 911 all my web files from time to time with one apology at the beginning but eventually it purges all my web files without notice again and again with an assumption that we users will quickly get used to this with self-adaptation. During the adaptation process, however, I lost the files from my local drives.

Today, I found it in one of  my old backup CD's. So, I immediately put all the related files here with an apology to all those who wrote me with fruitfulless response or even worse, with no response.
  Dr Chen's digital differentiator (DD) webpage and codes.
Send me an email so that I can inform you when it is ready.

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(re-)Created 03/01/2003.

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